p. 33 Absolute space: Isaac Newton, “Fundamental Principles of Natural Philosophy,” in Newton’s Philosophy of Nature, H. S. Thayer, ed. (New York: Hafner Publishing Co., 1953), pp. 17-18.

p. 33 Relative quantities: Ibid., p. 23.

p. 33 Instead of referring a moving body: Ernst Mach, The Science of Mechanics, translated by Thomas McCormack (Chicago: Open Court, 1907), p. 234.

p. 34 The fact that the needle: Albert Einstein, “Autobiographisches,” in Albert Einstein als Philosoph und Naturforscher [Albert Einstein as a Philosopher and Scientist], Paul Arthur Schilpp, ed. (Braunschweig: Vieweg, 1979), p. 7. Quoted in Albrecht Fölsing, Albert Einstein, translated by Ewald Osers (New York: Penguin, 1997), p. 14.

p. 39 How does it come: Albert Einstein, Autobiographical Notes, translated and edited by Paul Arthur Schilpp (La Salle, Ill.: Open Court, 1979), p. 59.

p. 54 That was my problem: Carl Sagan, interviewed on Nova: Time Travel.

p. 60 We know almost nothing: Bryce DeWitt, reported in The First William Fairbank Meeting on Relativistic Gravitational Experiments in Space, M. Demianski and C. W. F. Everitt, eds. (Singapore: World Scientific, 1993), p. xvii.

p. 66 My father: C. W. Francis Everitt, personal communication, January 26, 2005.

p. 70 Jerrold said to me: Interview with Rainer Weiss, Haverford College, April 5, 2005.

p. 72 Observing gravitational waves: Ibid.

p. 76 committed something in the theory: Letter from Albert Einstein to Paul Ehrenfest, February 4, 1917. Quoted by Albrecht